Disclosed by the present invention are a bio-organic fertilizer and a preparation method therefor and an application thereof. The bio-organic fertilizer, by parts by weight, comprises: 25-35 parts of household wastes, 55-65 parts of water, 9-10 parts of brown sugar and 0.1-1 parts of liqueur koji, wherein the household wastes are mainly plant waste such as vegetables, melons and fruits, and leftovers. According to the present invention, the existing household wastes are deposited, cleaned and sorted out, and then vegetables, melons and fruits, and leftovers therein are loaded into a container and are converted into a liquid organic fertilizer after special treatment. The liquid organic fertilizer not only contains beneficial bacteria which can stimulate root branching, increase plant surface absorption and promote plant growth, but also has a function of Trichoderma resistance, which can protect plants from contamination of harmful substances in soil. The bio-organic fertilizer also contains collagen, nitrogen, phosphorus, and potassium required for plant growth, and can completely replace chemical fertilizers.
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